When pasting tempo text a question mark is displayed

Precondition
MuseScore 3.4.2.25137 on macOS Catalina 10.15.4

Steps to reproduce
Create a new item in tempo palette:
1. Start by adding both a dotted 1/8th = tempo marking and a quarter = tempo marking.
2. Double click the latter and copy the quarter note text element.
3. Double click the dotted 1/8th tempo marking and paste the quarter note instead of the value

Actual result
A question mark is displayed

Expected result
The copied note should be displayed.

Note
The actual temp function works as expected.