The Bug
When flying, stuff like cobwebs and vines don't slow you down, so this shouldn't either. Its also worth noting that while doing these things, the player isn't slowed down while flying up or down, just in a horizontal direction.
Affected Actions
-Eating/Drinking
-Loading Bows or Crossbows
-Looking through spyglasses
-Throwing Tridents
Steps to Reproduce
Switch into creative mode and begin flying horizontally at a constant speed.
Perform any of the actions listed above, for example, eat some food.
Take note as to whether or not horizontal flying speed in creative mode is slowed down when performing several actions.
Observed Behavior
Horizontal flying speed in creative mode is slowed down when performing several actions.
Expected Behavior
Horizontal flying speed in creative mode would not be slowed down when performing several actions.
Related issues
Attachments
Comments


Other actions like using a bow or eating also slow you down, so I don't think this is a bug.
I changed the report to include all cases where actions slow flying players down

I can confirm this.
Can confirm in 20w51a.
Can confirm in 21w03a.
Can confirm in 21w05b. Relates to MC-12829.
Can confirm in 21w06a.
Can confirm in 21w07a.
Can confirm in 21w11a.
Can confirm in 21w13a.
Can confirm in 1.16.5 and 21w14a.

Can confirm in 21w15a
Can confirm in 21w16a.
Can confirm in 21w17a.
Can confirm in 1.17.
Can confirm in 1.17.1.
Can confirm this behavior in 21w42a. Here are some extra details regarding this problem.
The Bug:
Horizontal flying speed in creative mode is slowed down when performing several actions.
The actions you can perform to slow down your horizontal flying speed in creative mode include:
Eating and drinking.
Charging bows and crossbows.
Using spyglasses.
Preparing to throw tridents.
Steps to Reproduce:
Switch into creative mode and begin flying horizontally at a constant speed.
Perform any of the actions listed above, for example, eat some food.
Take note as to whether or not horizontal flying speed in creative mode is slowed down when performing several actions.
Observed Behavior:
Horizontal flying speed in creative mode is slowed down when performing several actions.
Expected Behavior:
Horizontal flying speed in creative mode would not be slowed down when performing several actions.
Can confirm in 1.18.2 and 22w11a.
Can confirm in 22w17a. This can now also be seen when using the goat horn.
Can confirm in 1.19.2.
Whether or not all of these are applicable or valid for this issue, here are other actions to note that slow down the player while flying:
Using a brush on suspicious sand/gravel
Using a shield
Throwing an ender eye, and holding the use button down after. (MC-107185)

Can confirm in 24w44a