`pio run -t compiledb` does not generate compilation database for tests

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Configuration

Operating system: Arch Linux

PlatformIO Version (platformio --version): PlatformIO Core, version 6.1.14

Description of problem

I use pio run -t compiledb to generate a compilation database that clangd can utilise. However, I noticed that the generated database does not include the path to unity.h and hence I get linter errors in my editor (neovim) whenever I try to include unity.h.

Steps to Reproduce

1. pio run -t compiledb

Actual Results

Compilation database only generated for project root.

Expected Results

Compilation database should also be generated for tests.