gedit highlights indexes of multidimensional arrays as comments in Perl mode

In gedit's Perl highlight mode, variables of all kinds ($var, %hash, @array etc.) are highlighted in dark green. The same usually works for the last index of an array as well ($#array) but only if the array is one-dimensional. With multidimensional arrays, the proper syntax is more complicated: $#{$array[0]} should give the last index of the first element of an array of arrays. Here gedit however interprets the number sign (#) as the mark of a comment and highlights the rest of the line in blue. The expected behavior would be to highlight $#{$array[0]} in dark green like all other variables. See the attached screenshot.

Description: Ubuntu 18.04.1 LTS
Release: 18.04

gedit:
  Installed: 3.28.1-1ubuntu1
  Candidate: 3.28.1-1ubuntu1
  Version table:
 *** 3.28.1-1ubuntu1 500
        500 http://mr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gedit 3.28.1-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-38.41-generic 4.15.18
Uname: Linux 4.15.0-38-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 30 12:27:38 2018
InstallationDate: Installed on 2017-02-13 (624 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fi_FI.UTF-8
 SHELL=/bin/bash
SourcePackage: gedit
UpgradeStatus: Upgraded to bionic on 2018-05-31 (151 days ago)