mixed cart items does not apply coupon to subscription

Hi. I have defined a “recurring product % discount” coupon that sets a usage restriction that requires “normal product A” AND “subscription product B” to be in the cart before the coupon is auto applied.

What I see is that the coupon is applied to the order “Total”, but not to the “Recurring total”.

It works when the coupon only required the subscription product.

Any help much appreciated.

WP 5.1.1
PHP 7.x
Woo 3.5.7
Woo Subs 2.4.7
latest plugin (28/3/19)