Unsure if a port revision bump is actually necessary but I think the conflicts_install are embedded in the package so it should be rebuild.
Created attachment 223184 [details] mono68.diff mono68.diff
A commit in branch main references this bug: URL: https://cgit.FreeBSD.org/ports/commit/?id=18510dda5f3729f2b12bfdf8934dca6389b24d83 commit 18510dda5f3729f2b12bfdf8934dca6389b24d83 Author: Dries Michiels <driesm@FreeBSD.org> AuthorDate: 2021-11-15 19:43:38 +0000 Commit: Dries Michiels <driesm@FreeBSD.org> CommitDate: 2021-11-16 19:41:21 +0000 lang/mono6.8: Fix version in CONFLICTS_INSTALL PR: 254222 Approved by: 0mp (mentor), portmgr (blanket) Differential Revision: https://reviews.freebsd.org/D32998 lang/mono6.8/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)