LspRename sometimes hangs

[BackSeat]

vim-lsp git hash c20c665, Python file. Using LspRename sometimes just hangs with new name: XXXX ... Renaming ... in the message window.

Doesn't always happen, and seems to be file related (ie, it works fine in some files and not others).

I appreciate there's not much to go on above. What can I do to provide more information?

Thanks.