Also happens with any custom models added with datapacks/resourcepacks or mods that uses the translucent render type and has an inner part. The problem seems to go away momentairly if you place a block near the affected one.
This seems to have gotten way worse since the latest 1.14 snapshots. Now if a player is moving on them while the piston is extending, he almost never gets launched up.
Also happens with any custom models added with datapacks/resourcepacks or mods that uses the translucent render type and has an inner part. The problem seems to go away momentairly if you place a block near the affected one.