I have all automated hotbar behaviour options turned off (most importantly 'remove unmemorised skills').
When I use a Polymorph skill granting a temporary ability, and then proceed to use that ability, the skill is removed from my hotbar at the end of combat / when the original skill runs out. This should not happen. To be clear I will use Medusa Head as an example:
1. Use Medusa Head
2. Activate the temporary granted skill Petrifying Visage
3. When Medusa Head times out, Petrifying Visage is incorrectly removed from the hotbar, despite the option for this being turned off
4. This is applicable to every single Polymorph skill
This bug was at one point fixed in the game I believe. Additionally, the automated hotbar behaviour does not have an option for miscellaneous items such as teleporter pyramids or bedrolls, which I feel it should - nevertheless that is an oversight not a bug.
Please fix this bug, as it makes it rather tedious playing a Polymorph at the moment. I have posted to reddit and have found I am not the only person this is currently happening to.