Description
I have a Shukenja Helm on a Sorcerer that, amongst other things, gives a bonus lvl 0 spell slot. If I cast polymorph, I will immeadiately lose a lvl 0 spell slot and lose an additional one whenever polymorph is reapplied (each area transition).
This other bonus spell slots (level 1, 2 and 3) are unaffected and are properly restored to values before polymorph, when the polymorph effect ends, so it seems to only be a problem for lvl 0 bonus spell slots.
How to reproduce
Have a sorcerer with an item that grants a bonus lvl 0 spell slot
Optionally have an item with bonus spells slots of a higher level also (to compare and see that those are not affected)
Cast polymorph Self
Optionally try some area transitions as well and see your casts of lvl 0 spells go down
End the polymorph and check that casts of level 0 spells remain lower than before polymorph
Where did it happen
Seen on in the underdark on win11