Problem when opening a photo from Lightroom Classic to Photoshop - edit in Photoshop updated version

When  I should open a photo in that I had i. LR classic I choose edit in Photoshop because my photo was of a woman with a cigarette and I would like to add smoke with generate fill in Photoshop- when I opened the file in Photoshop I was asked to convert to adobe rgb because otherwise I could not perform generate fill - when I should convert I discovered that the from LR had a very strange profile - Linear rec. 2020 ( in LR I have as default ProPhoto 16 bit) so I cannot understand this profile Linear rec. 2020??!! And when I converted this file to Adobe Rgb it turned far to light looking very bad!!!

Both LR classic and Photoshop have latest updates so my question is - has anyone else had the problem? Is there a bug somehow??? How do I habdle this?? Most grateful for advice? Further this image is rather important! Thanks!!!! Jenny  - I work on Mac