Unable to create aftergrace at the end of bar

Musescore can only create aftergraces on a note, but not a rest, especially at the end of a bar. See string passage of rehearsal 7 of this score:
https://musescore.com/user/6053266/scores/7249776
Derek has to use another voice to enter small notes, with incorrect braille output, and is the only workaround. When Logical.ly produced the complete ballet for me, he could only think to add normal graces at the next bar, if they can be in the same voice. Sibelius can input aftergraces at the end of a bar, by adjusting the x position of the grace notes at the beginning of next bar. But in Musescore, we can implement aftergraces after a rest, at the end of bar. It's valid in both notation and Musicxml, and I worked with such Sibelius files well.

Haipeng