Frost Walker does not take effect when the wearer is pushed into water by a piston

Sorry, I believe your issue is invalid.

Step 1: Put Frost Walker on boots.

Step 2: Put it on an armor stand.

Step 3: Find a river or any body of water.

Step 4: Step in between the block and water then do

"/tp @e[type=armor_stand]"

Please provide a screenshot of your game with the F3 debug screen enabled.

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Sorry, I believe your issue is invalid.

Step 1: Put Frost Walker on boots.

Step 2: Put it on an armor stand.

Step 3: Find a river or any body of water.

Step 4: Step in between the block and water then do

"/tp @e[type=armor_stand]"

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Thank you for your reply. I tested this and /tp command seems to make it work. I think what I failed to realize earlier was that armor stand needs to be moving for it to create ice and somehow when moved simply one block with piston isn't enough. I'm not sure if this is intended or not:

Optifine is a heavy game modification and using it invalidates reports for the bug tracker. Please test this without any mods installed at all.

It seems to have same results without optifine on:

It works if you push the armor stand around with slime blocks like the following for example in flying maschines (Apologies for the grainy background, resource packs fault): 

1.19 Cannot get frosted ice to form even when pushing the armour stand with only slime blocks

Frosted ice forms fine if I wear the enchanted boots 

Still an issue in 1.19.2

Not exclusive to armor stands.

наверное сюда пишу исправьте на бедрок эдшен панели инструментов исчезает и крестик в центре исчезает такого не было в предыдущих версиях