I can confirm this behavior after updating i3-wm on sid as well. Though I can't reproduce the behavior after building from upstream:
$ git clone https://github.com/i3/i3 $ mkdir -p i3/build ; cd i3/build $ meson setup $ ninja $ ./i3bar Curiously, the version of that patch from debian/patches (https://salsa.debian.org/i3-team/i3-wm/-/blob/debian/unstable/debian/patches/bts1126791) includes both the actual patch as well as an indented patch used for testing. The testing patch includes "sleep(1);" when parsing the workspaces IPC response. I wonder if this part of the patch file is *also* applied to the source, in addition to the rest of the patch file? ~ Chris
