Stracing the app reveals what the problem is:
12442 open("/snap/libreoffice/47/lib/libreoffice/share/template/common/presnt/Blueprint_Plans.otp", O_RDWR) = -1 EROFS (Read-only file system)
the app is trying to open the template file in read/write mode, but it's in a read-only location.
Stracing the app reveals what the problem is:
12442 open("/ snap/libreoffic e/47/lib/ libreoffice/ share/template/ common/ presnt/ Blueprint_ Plans.otp" , O_RDWR) = -1 EROFS (Read-only file system)
the app is trying to open the template file in read/write mode, but it's in a read-only location.