Uninstalling Category discounts messes up orders list in admin

I used category discounts for a while, but then realized that I need to either bulk edit products to have same discounts or just manually add them so that all necessary features (product filters, SEO etc) work properly as designed.

After I disable Category Discounts plugin, the order information is messed up with unwanted meta_keys that originate from the plugin. When I enable the plugin again even without any active rule, it’s fine again. How can get rid of this? I know WooCommerce saves this meta_key in the woocommerce_order_itemmetadata table but I wouldn’t just go and start deleting all the keys.

I cannot remove the final random “rule” as it just doesn’t allow me.

Plugin enabled:
https://prnt.sc/11r3o4d
Settings:
https://prnt.sc/11r3y0u
Plugin disabled:
https://prnt.sc/11r3q49
Browser console logs:

<input type="hidden" name="order_item_tax_class[27677]" value="" />

				<div class="view">
			<table cellspacing="0" class="display_meta">
							<tr>
					<th>_Wcd_applied_discount_rules:</th>
					<td><p>[]</p>
</td>
				</tr>
							<tr>
					<th>_Wcd_applied_discount_amounts:</th>
					<td><p>{"23401":{"original_price":35,"discount_price":0},"22354":{"original_price":36,"discount_price":0},"6369":{"original_price":35,"discount_price":0}}</p>
</td>
				</tr>
					</table>

The page I need help with: [log in to see the link]