Broken Boundary Definition in 1.949 on long Boundary string

Hello,

setting the body of a part "destroys" the boundary definition if the boundary string is longer than 64 characters:

Input, before setting body:

Content-Type: multipart/mixed; boundary="----=_=-_OpenGroupware_org_NGMime-271126-1610362255.619911-39------"

Result, after setting body:

Content-Type: multipart/mixed; boundary*0="----=_=-_OpenGroupware_org_NGMime-271126-1610362255.619911-39--"; boundary*1="----"; boundary="----=_=-_OpenGroupware_org_NGMime-271126-1610362255.619911-39-..."

Thanks,

fse