A bug with a unique staff that grants a seal of power

You can't insert any of the existing support gems into the skill, although everything worked fine before and I had the gems there. I made a new build and ran into the problem of not being able to place support gems in the skill.
The whole essence of the problem can be seen in the screenshots below.
https://ibb.co/9Ht9JjQh
https://ibb.co/Ps4RbrPy
https://ibb.co/JWLB1Cm2