Coupons ignore inclusions/exclusions completely

Scenario:
I sell various things on my shop – some with higher profit margins than others. I want to run a sale. Most products get a big discount. Other products get a small discount – set on a per product basis.

The coupon is a product % discount that’s setup with the big discount.
I’ve set it to exclude some products (because I’ve already set the discount on them manually).

Jigoshop completely ignores exclusions and inclusions. It applies the discount regardless of whether the products are in the right category (I sell products from a few other companies – they’re not on sale. Jigoshop disagrees…).

I’m not using several different coupons at the same time. This is basic functionality we’re talking about and it’s completely broken. It used to work, what happened?

Right, that’s all you’re getting, I’ve got to go set discounts manually on a load of products thanks to this problem.

### WordPress Environment ###

Home URL: https://fox-box.co.uk
Site URL: https://fox-box.co.uk
Jigoshop Version: 2.1.9
Jigoshop Database Version: 
Log Directory Writable: Yes
WP Version: 4.9.1
WP Multisite: No
WP Memory Limit: 256 MB
WP Debug Mode: No
Language: en_GB

### Server Environment ###

Server Info: Apache/2.4.7 (Ubuntu)
PHP Version: 7.1.11-1+ubuntu14.04.1+deb.sury.org+1
PHP Post Max Size: 8 MB
PHP Time Limit: 8 MB
PHP Max Input Vars: 1000
SUHOSIN Installed: No
eAccelerator: No
APC: No
OpCache: Yes
Short Open Tag: No
Allow URL fopen: Yes
Session: Yes
Cookie Path: /
Save Path: /var/lib/php/sessions
Use Cookies: Yes
Use Only Cookies: Yes
Max Upload Size: 8 MB
Default Timezone: UTC
fsockopen/cURL: Yes
SoapClient: No
Remote Post: Yes
Remote Get: Yes

### Server Locale ###

Decimal Point: .
Thousands Separator: No
Monetary Decimal Point: No
Monetary Thousands Separator: No

### Active Plugins (16) ###

Akismet Anti-Spam: by Automattic – 4.0.2
Breadcrumb NavXT: by John Havlik – 5.7.1
Google Analyticator: by SumoMe – 6.5.4
Google XML Sitemaps: by Arne Brachhold – 4.0.9
Jetpack by WordPress.com: by Automattic – 5.6.1
Jigoshop eCommerce: by Jigo Ltd – 2.1.9
Premium Shipping for Jigoshop: by Jigo Ltd – 2.0.7
SEO Ultimate: by SEO Design Solutions – 7.6.5.9
Site Offline or Coming Soon: by wpecommerce – 1.6.6
StopBadBots: by Bill Minozzi – 4.71
PluginChief Twitter Badge Widget: by Andy Clark, Brandon Camenisch, Jason Bahl – 1.75
Cookie Consent: by Catapult_Themes – 2.3.4
WP Mail SMTP: by WPForms – 1.2.1
WP-Optimize: by David Anderson, Ruhani Rabin, Team Updraft – 2.1.1
WP-PageNavi: by Lester 'GaMerZ' Chan – 2.92
WP-reCAPTCHA: by  – 4.1

### Settings ###

Force SSL: Yes
Shipping Enabled: Yes
Shipping Enabled: GBP(￡)
Currency Position: ￡0.00
Thousand Separator: ,
Decimal Separator: .
Number of Decimals: 2

### Jigoshop Pages ###

Shop Base: #164
Cart: #389
Checkout: #390
Thank You: #107
My account: #36
Terms: No

### Theme ###

Name: Easel
Version: 2.0.7
Author URL: https://frumph.net
Child Theme: No
Parent Theme Name: No
Parent Theme Version: No
Parent Theme Author URL: No

### Templates ###

No Overrides: