Creepers unable to swim properly/ Players unable to swim up though one high air gap whilst sneaking

Caused by changes to mob hitbox size in 1.9; could be intentional.

Bob, mob hitbox size changes may have something to do with this bug, but I doubt it as shown in my vid the creepers hitbox in in the water above it but the creeper fails to swim up it, I also doubt highly that this is intentional as 1. the creeper does eventully make its way up the water (so then there a bug there) and 2. that mojang will even want to break it, as there's no clear reason to, when most other 2 tall mobs still work.

I think eye level is what is used to determine whether the mob should swim up or not and not whether any part of the hitbox is in the water. In any case, the creeper used to be 1.8 blocks high but is now 1.7 blocks high (can fit between 2 snow layers and a trapdoor) while the other mobs are all at least 1.9 blocks high (cannot fit in a 2 block space with a lilypad). On second thoughts, this side-effect is probably unintended and creepers should be made a bit taller (or at least their hitbox should be) so they act like all other ~2 block high mobs. The reason for the change was that creepers used to float off the ground by a pixel because their texture actually used to be 1 pixel shorter than their model/hitbox.

That may be it, thanks for the info

Fail to see a bug here.
Creeper in shallow or deep water float / swim without problems.
Why do you think this is a bug ?

I think that the bug is that unlike all other 2-high mobs, the creeper cannot easily swim up water elevators. Additionally, the creeper's ability to swim up the elevator is inconsistent. A fix might be to adjust the creeper's hitbox so it is either taller (can swim up easily) or shorter (cannot swim up at all).

A "water elevator" is not a Minecraft feature. It's something player-built exploiting the Minecraft mechanics.

I am not the reporter of this bug; that is just how I understood it. You can work around this using a 2-wide elevator, anyway.

but the underlying mechanics are broken, which is a bug.
I think this is a bug because a creeper is in water and is not swimming up, the 'water elevator' is showing this bug/ a case where the bug is easily and reliably reproducible.
also Players are unable swim through these spaces when sneaking, which is inconsistent as you can swim up when not sneaking

This also adds another inconsistency shown here: https://www.youtube.com/watch?v=h6-Ne7Wo-wY&feature=youtu.be

Affects 16w20a

Is this issue reopened or not because in the bug it says reopened but it fails to show up in the 'my open issues' section or when I search for 'Creepers unable to swim properly/ unable to swim up though 1 high air gap whilst sneaking' (https://bugs.mojang.com/issues/?filter=10613&jql=project%20%3D%20MC%20AND%20status%20%3D%20Open%20AND%20text%20~%20%22Creepers%20unable%20to%20swim%20properly%2F%20unable%20to%20swim%20up%20though%201%20high%20air%20gap%20whilst%20sneaking%22%20ORDER%20BY%20affectedVersion)
I think I may have bugged out the bug tracker - LOL

You search for status=open, but the status is REopened, search for resolution=unresolved instead.

Thanks FVbico that makes sence - it is a little odd that a reopened bug is not same an open bug though when searching and fails to show up under the 'my open issues' section

As has not been marked as a duplicate yet i'll assume that this has not been reported before - removing
"
This must have been reported before but I couldn't find the report (sorry mods - to prove I did search here is a link to one of my searches: https://bugs.mojang.com/issues/?filter=10613&jql=project%20%3D%20MC%20AND%20status%20%3D%20Open%20AND%20text%20~%20%22unable%20to%20swim%22%20ORDER%20BY%20affectedVersion)
"
from the bugs description

Also Affects 1.10.2 (its not letting me update the affected versions though)

FYI: going on a holiday for a few weeks - therefore won't be updating this bug as I'll not have access to a PC so ill be unable to test any new versions of MC - sorry 😞

A friend tested this in 16w32a and the bug apparently still affects this version but I've not tested myself - added 16w32a to affected versions list (note: currently on holiday so may/will not be consistant with updating this bug)

Affects 16w40a

Affects 16w42a + 16w41a

@unknown, you don't have to write a comment if you can update the affected versions yourself.

Sorry, saw it on a lot of other bug reports and thought that what your meant to do, sorry 😞
EDIT: Thanks for the advice though

My browser seems to be acting up so I also add a comment but minecraft 1.11.2 is also affected (let me know if its not so I can read it - thanks)

FYI: Due to current issues at work (having to work 60 hours a week and doing a training course for new equipment) , i will be unable to provide frequent updates on this bug report for a while (may be a year or two though) if someone wants to test the bug in the meantime please use the attached bug test world (open the world give the world 30 secs to perform the test and add the version tested with to the affected versions list), i will try to update the major release versions eg. 1.13.0, 1.14.0 ect but i can't make any gurentees.

If 1.13 breaks the command blocks in the bug test world ill try to get them updated, ive already got a working version in the snapshot 18w15a

Creepers fixed in 1.13 pre 1, unable to test player, as unable to swim sneaking at all - assuming this is a snapshot related bug, tested in 1.13 pre 1 and 1.13 pre 5 will test again when 1.13 comes out, added 1.13 pre 5 to affected versions as still unable to swim whilst sneaking in 1.13 pre 5

Same in pre 6 adding for same reason listed above

Creepers somewhat fixed but only when water level in the water stream is high enough, player still affected by the issue above