Group object effect disappears

[mushio0122]

I have updated to Illustrator 2025 (29.1)
There is a problem with the latest version.
Grouping multiple of objects using multiplication and then ungrouping them will remove the effect.
The multiplication that had been set up has disappeared.
The same thing happens with other data and is reproducible.

I am using a translator.I apologize for my poor English. 

[Ton Frederiks]

Can you show the Appearance panel with the group selected?

As far as I know this has always worked liked this, an effect or blending mode applied to a group will disappear when the objects are ungrouped.