Yoann

Why ?...
It's not cool for map makers ...
It will be nice to be able to give them all the effects using commands.
And how to explain that the wither takes damage due to splash potions but not from commands...

There is another bug in 1.15.1 which is in another form, as in the video below, I place a tile and then I use the following command on the block:

/summon minecraft:falling_block -433 111 -168 {BlockState:{Name:"minecraft:andesite_slab",Properties:{type:top}},Time:-1000000,NoGravity:true}

at that time, the block turns into a ghost block that can no longer be broken. Then I delete the falling block and the block is invisible, you have to click on it so that it reappears to break it.

The video : https://youtu.be/7q64k9DMdX8

Comfirmed for 1.15.1

/data merge entity @e[limit=1,sort=nearest,type=painting] {Invulnerable:1b}

Hello,
Since a lot of version I have this problem ... When I copy a command block with the click wheel and the control key, the command is copied inside, however the “Conditional” option is not saved which is problematic in the following situation.
If I place a chain command block with a teleport command following a reapeting command block, the player is endlessly teleported to the same place, the only solution is to remember the coordinates of the command block to delete it ...
Besides, it would be great to have a gamerule allowing to stop the command blocks as on the servers.

In 1.15.1 there is the same bug...

Hello, recently, I made a data pack in 1.14.3 that adds a sword that can launch fireballs (more precisely make them appear in the direction where the player looks, besides I can not make them appear for her to leave all alone in the direction where the player is looking, finally), when it appears, it starts to disappear and reappear, it's very annoying. It happens to me the same problem with the ghast who is not far from me and who throws me a fireball then disappears with her ...

It's ok

I made the same experience in 1.12.2 vanilla and the same problem happens, the video has been updated.

Oh, sorry Kumasasa, my problem was resolved so I stopped following the issue, and I just saw you asked me a new forced-crash report.

I don't know if you still need it but here it is.

Edit : i think you actually asked this before I said it was resolved, didn't you ?

Oh, sorry :s

Edit (a bit late) : updating Catalyst resolved the problem for me.