Possible cause

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

Connector terminal disconnection, poor contact, damage, deformation, corrosion
Shift panel (indicator) power supply voltage or body ground malfunction
Open circuit in wiring harness between shift panel (indicator) and dash-electrical supply unit
Shift panel (indicator) malfunction