Vim8.2.2154 html filetype detection cause error incompatiblity with vim9script

Hi,

When opening html file in new buffer while my _vimrc is written in vim9script,

this message appears:

Messages maintainer: Bram Moolenaar

"~\Desktop\filetype.vim.html" 2315L, 216123B

Error detected while processing BufRead Autocommands for "*.html"..function dist#ft#FThtml[13]..FileType Autocommands for "html":

E1126: Cannot use :let in Vim9 script

E1126: Cannot use :let in Vim9 script 

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