When :TagsGenerate is run while a help file is open (including if g:vim_tags_auto_generate == 1 and the tags file there is writeable, vim-tags rewrites it to contain the contents of maketags.awk and makehtml.awk and wipes out the tags for the help files. Since these tags are needed to locate help topics, running :help with this plugin enabled may be enough to not let you find that help topic again.
I filed neovim/neovim#4552 before I realized that vim-tags was the culprit.
When
:TagsGenerateis run while a help file is open (including ifg:vim_tags_auto_generate == 1and the tags file there is writeable, vim-tags rewrites it to contain the contents ofmaketags.awkandmakehtml.awkand wipes out the tags for the help files. Since these tags are needed to locate help topics, running:helpwith this plugin enabled may be enough to not let you find that help topic again.I filed neovim/neovim#4552 before I realized that vim-tags was the culprit.