Slicer generates a support leg that don't support anything

[tannisroot]

Description of the bug

Using default print settings, and regardless if I use autogenerated supports or paint-on support (painting everything red but overhanging parts which are painted blue), when using Grid supports, Prusa Slicer 2.7.1 creates this support leg that doesn't actually support anything and doesn't attach to anything.
But if you increase "Pattern Spacing" away from default 2 mm to for example 3 mm, that leg becomes one with the support structure.

Project file & How to reproduce

lsi-fan-bracket-v4.zip

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

PrusaSlicer-2.7.1+linux-x64-GTK3-202312121425.AppImage

Operating system

Arch Linux

Printer model

Original Prusa Mini+