ctrl+g fails after ctrl+r and arrow up/down

[ñull]

The usual way to find previous commands is ctrl+r and then use the arrow up/down keys. You can exit the search with ctrl+g. One day this stopped working (after an update of the package?). It still works when I don't touch the arrow keys, but when you do, the only way I know to get out is back-deleting the retrieved command.

$ lsb_release -rd
Description: Ubuntu 16.04.5 LTS
$ bash --version
GNU bash, version 4.3.48(1)-release (x86_64-pc-linux-gnu)
$ apt-cache policy bash
bash:
  Installed: 4.3-14ubuntu1.2
  Candidate: 4.3-14ubuntu1.2
  Version table:
 *** 4.3-14ubuntu1.2 500
        500 mirror://mirrors.ubuntu.com/mirrors.txt xenial-updates/main amd64 Packages
        500 mirror://mirrors.ubuntu.com/mirrors.txt xenial-security/main amd64 Packages
        100 /var/lib/dpkg/status
     4.3-14ubuntu1 500
        500 mirror://mirrors.ubuntu.com/mirrors.txt xenial/main amd64 Packages