Incorrect type on string-key fields when combined with `[string]`

How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

Which OS are you using?

Windows

What is the issue affecting?

Type Checking

Expected Behaviour

we have a (generated) class like

---@class GlobalModSettings
---@field ["heat-visualizer-updates-per-surface-per-tick"] ModSetting<int32>
---@field ["nixie-tube-update-speed-alpha"] ModSetting<int32>
---@field ["nixie-tube-update-speed-numeric"] ModSetting<int32>
---@field [string] ModSetting<(int32)|(double)|(boolean)|(string)|(Color)>

which has narrower types for the known entries and a general type for the "everything else" field, but when i then use this type like

local x = settings.global["heat-visualizer-updates-per-surface-per-tick"]

x is given the type from the [string] field, rather than the one that is an exact match for that specific string

Actual Behaviour

(this template is always off screen and i've written the whole thing in the first box...)

Reproduction steps

(this template is always off screen and i've written the whole thing in the first box...)

Additional Notes

No response

Log File

No response

No repository file or test is named. Start by reproducing the annotated GlobalModSettings lookup in the Lua language server through the Visual Studio Code extension, then trace indexed-field type resolution. Done means an exact string-key field receives its narrower type instead of the broader [string] field type.