New line triggered replace tab indent to spaces

[d-enk]

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Linux

What is the issue affecting?

Formatting

Expected Behaviour

do nothing

Actual Behaviour

tab indent replaced to spaces

Reproduction steps

add new line

Additional Notes

configuration has no effect

"Lua.format.enable": false,
"Lua.format.defaultConfig": {
  "indent_style": "tab"
},

Log File

No response