where have all the arrows gone?

[rsrsrs]

scenario:
> i make an object in xara.
> export it as cmx
> open it in corel draw 2018 and make the dimensioning of the object
> copy it it clipboard [strg c]
> go to xara and import it as cmx [strg v]

works perfekt until so far.
if i safe the file and reopen it, all arrows are gone.
if i export it as pdf and reopen it in xara all arrows are there.
any idea or solution?