[GPX / GP Import]Tempo on dotted quarter are not imported properly

Create a Guitar Pro 6 file (GPX format) and/or or a Guitar Pro 7.5/8 (GP format).
Set a dotted quarter tempo (e.g. in a 12/8 song)
Open the file in MuseScore.
Expected:
The tempo has the same value and applies on a dotted quarter.
Actuals
The tempo has the same value but applies on a quarter.

In Guitar Pro 8

In MuseScore after import