Number of digits wrong for round if round is within an if or case construct

If you use the round function within an if or case construct, the number of digits may not be correct.

Statement: select if(true, round(1.190000, 2), round(1.00000, 6));
Expected result: 1.19
Actual result: 1.190000

Workaround: Move the round outside.
Statement: select round(if(true, 1.190000, 1.000000), if(true, 2, 6));
Expected result: 1.19
Actual result: 1.19

The bug came from version 5.5.32 to version 5.5.33 and from version 10.0.4 to version 10.0.5.
The 10.1, 10.2, 10.3 and 10.4 branches are affected in all versions.