Tag Edit Cloud doesn't work when sorted by Relevance

[MetallicAchu]

Server Software
about:
title: "Shosho's Gallery"
theme: "danbooru2"
url: "http://adars.co.il/"

versions:
shimmie: "2.8.4+"
schema: 21
php: "7.3.27"
db: "mysql 5.6.41-84.1"
os: "Linux gator3235.hostgator.com 4.14.146-225.ELK.el6.x86_64 #1 SMP Sat Sep 21 01:19:55 CDT 2019 x86_64"
server: "Apache"

extensions:
core: ["admin","alias_editor","bbcode","comment","download","et","ext_manager","four_oh_four","handle_pixel","help_pages","image","index","media","mime","setup","static_files","system","tag_edit","tag_list","upgrade","upload","user","user_config","view"]
extra: ["auto_tagger","autocomplete","bulk_actions","bulk_add","bulk_download","favorites","featured","google_analytics","handle_video","home","image_view_counter","random_image","random_list","rating","regen_thumb","rotate","site_description","sitemap","tag_categories","tag_editcloud","tag_history","tag_tools","tips","update","wiki"]
handled_mimes: ["image/jpeg","image/gif","image/png","image/webp","video/x-ms-asf","video/x-msvideo","video/x-flv","video/x-matroska","video/mp4","video/ogg","video/quicktime","video/webm"]

stats:
images: 38894
comments: 0
users: 3

media:
memory_limit: "8.0MB"
disk_use: "1.4TB"
disk_total: "1.5TB"

thumbnails:
engine: "gd"
quality: 75
width: 192
height: 192
scaling: 100
mime: "image/jpeg"

git:
commit: "efde5e1"
branch: "HEAD"
origin: "https://github.com/shish/shimmie2"

What steps trigger this bug
When sorting Tag Edit Cloud option by Relevance, it doesn't show any tags in the Edit Cloud, at all.

What did you expect to happen?
On the left side of the screen, there is a list populated by related tags, expected this option to mirror that list on the cloud edit option, but on my end nothing happened.

What actually happened?
Shows only the image's current tags

[JamesTheSergal]

I am also having this issue.

[jellykells]

Seeing the same issue along with this error in my logs

FastCGI sent in stderr: "PHP message: PHP Warning:  Array to string conversion in /srv/http/shimmie2/vendor/shish/ffsphp/src/PDOStatement.php on line 28

I enabled statement logging in postgres and it appears the literal string 'Array' is being passed as a parameter

DETAIL:  parameters: $1 = '2', $2 = '2', $3 = 'Array', $4 = '36'