identify breaks with latest ghostscript 9.26

[Skully]

Description: Ubuntu 16.04.5 LTS
Release: 16.04

imagemagick:
  Installed: 8:6.8.9.9-7ubuntu5.13
  Candidate: 8:6.8.9.9-7ubuntu5.13

ghostscript:
  Installed: 9.26~dfsg+0-0ubuntu0.16.04.1
  Candidate: 9.26~dfsg+0-0ubuntu0.16.04.1

Following command gives trouble:

> identify -format '%wx%h,%[exif:orientation]' 'test.pdf[0]'

which results in

> identify: FailedToExecuteCommand `"gs" -q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT .....

The commands:
> identify -format '%wx%h,%[exif:orientation]' 'test.pdf'

and

> identify 'test.pdf[0]'

are working but not the combination of both.

After downgrading ghostscript to version 9.18 (9.18~dfsg~0-0ubuntu2), all commands are working again.

test.pdf is just some random pdf file on my filesystem.