Created attachment 143630 [details] example file - take the attached file - open the size sidebar and set the width of the blue box to 4.40 and height to 1.90 cm - click somewhere outside the box to make the sidebar disappear - now check the soie of the box result: despite you just changed the width to 4.40 cm, the width is still 4.39 cm.
from programmer's point of view, Reordering the mpBindings->Update in the constructor of PosSizePropertyPanel sounds it would reduce this sort of stress. mpBindings->Update it just reduces the stress but would not be a final solution, especially when we manually change the measurement unit. https://ask.libreoffice.org/ja/question/149422/drawnotu-desaizuworu-li-suruga-zai-biao-shi-surutowu-chai-gabiao-shi-suru/
I can still reproduce the bug with LO 6.1.1RC1
I think we can close this as dupe *** This bug has been marked as a duplicate of bug 99711 ***