The bug
In previous versions, the name for the criteria for obtaining a stripped log in the various hanging sign recipe unlocking advancements was has_stripped_logs. Since 26.2-snapshot-7 merged some of the sign/hanging sign behavior, the criterion name was changed to has_planks. This name is inaccurate since the advancements still check for stripped logs.
This is a minor issue with no gameplay impact.
How to reproduce
Type
/advancement grant @s only recipes/decorations/oak_hanging_signwith a spaceLook at the tab-complete suggestions
Expected result
Should be has_stripped_logs and has_the_recipe
Observed result
It’s has_planks and has_the_recipe
I can confirm that this is the case; perhaps it has something to do with the data version going from 4790 to 4891?