Class are both the correct class type and undefined

Nobody has claimed this yet.

### 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?

Type Checking

### Expected Behaviour

`IPv4Router` should be a kind of `Object`.

### Actual Behaviour


### Reproduction steps

1. Clone https://github.com/AR2000AR/openComputers_codes
2. Install the definitions https://github.com/AR2000AR/opencomputers-openos-definitions to reduce the number of errors. Wireshark related files errors can be ignored (since there is not complete definitions for Wireshark available yet)
3. Open [`network/lib/network/ipv4/IPv4Layer.lua:108`](https://github.com/AR2000AR/openComputers_codes/blob/840dbac82981aeddb7969502c63a32b4125f5ade/network/lib/network/ipv4/IPv4Layer.lua#L108)

### Additional Notes

312 errors with 3.7.4
9 errors with 3.6.21

### Log File

3.7.4 [file_home_ar2000_Documents_Programmation_Lua_openComputers_codes.worktrees_lls-rework.log](https://github.com/LuaLS/lua-language-server/files/14271928/file_home_ar2000_Documents_Programmation_Lua_openComputers_codes.worktrees_lls-rework.log)
3.6.21 [file_home_ar2000_Documents_Programmation_Lua_openComputers_codes.worktrees_lls-rework.log](https://github.com/LuaLS/lua-language-server/files/14271932/file_home_ar2000_Documents_Programmation_Lua_openComputers_codes.worktrees_lls-rework.log)

Reproduce the report using the openComputers_codes repository, its opencomputers-openos-definitions, and network/lib/network/ipv4/IPv4Layer.lua:108. Compare the diagnostics and logs from versions 3.7.4 and 3.6.21, then trace the type-checking behavior responsible for IPv4Router being both a class and undefined. Done means the reproduction no longer produces the reported incorrect diagnostics.

Written by the indexing model from the issue text.