Unicode input regression

[Graham Perrin]

Following my first pkg upgrade with 15.0-CURRENT, I no longer get the 
required character after input.

In applications such as Dolphin, Konsole, Firefox, and Thunderbird: the 
visible input (e.g. code 2013 for an en dash) is followed by disappearance.

In Code - OSS (editors/vscode): input is followed by visibility of the 
code (e.g. 2013), as if I typed it normally.

The version of IBus did not change.

Does anyone else have this regression?