It seems that reportbug picked up the dialog version installed on the machine it ran on which is a fork of the debian package. The bug is in
1.3-20190211 I've also checked that the latest upstream release still contains the buggy code.
- Bug#970508: dialog: --aspect and --tab-len options don't w... Rainer Weikusat
- Bug#970508: version in the bug report is wrong Rainer Weikusat
- Bug#970508: dialog: --aspect and --tab-len options do... Thomas Dickey
