Yes, but that's the reason I think it's a Plesk bug.
I wouldn't try that.
Your certificate is valid ( https://check-your-website.server-daten.de/?q=hub.wombatcms.com )
CN=hub.wombatcms.com
09.07.2019
07.10.2019
expires in 88 days 84world.com, 94finance.com, 94legal.com, 94tech.com, acrefieldsolutions.co.uk,
adme.me.uk, admin.wombatcms.com, agency.wombatcms.com, anme.co.uk, asoe.me.uk,
brook.w-sussex.sch.uk, camouse.co.uk, cheltenhamlaminating.co.uk, claygateceramics.co.uk,
cms.wombatcms.com, demoshr.co.uk, dts.solutions, eccrow.co.uk, ecochoice.co.uk,
edwardwaites.com, ejwminiatures.co.uk, ejwsilver.co.uk, elytaxis.co.uk, future-memories.co.uk,
gershonderosa.com, greenandpurple.net, greysofely.co.uk, hub.wombatcms.com, hytera-apps.co.uk,
indextus.com, jamesfanshawe.com, jameswillett.tv, koala.co.uk, legalsurveyors.co.uk, linton-pc.gov.uk,
malcofreight.co.uk, maurerinstruments.com, megahertz.co.uk, mnt-sas.com, oceacovers.co.uk,
oghl.co.uk, ogsi.ae, ogsl.com, oilandgasmeasurement.com, olympictyres.co.uk, pettittsports.co.uk,
picturemephotography.uk.com, poolboy.co.uk, property-helpline.com, showcase.dts.solutions,
thebridgefirstaid.co.uk, trbonet.co.uk, ukpoolandspaawards.co.uk, vscarpets.co.uk, waterlines.co.uk,
waveoncloud.co.uk, whytes.co.uk, winsoncoaches.co.uk, wombatcms.com, xtremeactive.co.uk,
xtremecorporate.co.uk -
61 entries
but you have a lot of active certificates.
7 certificates in the last 7 days, 14 active.
Perhaps it may be easier if you change your setup: Different small certificates, one certificate per main domain.
And ask Plesk. Perhaps they can fix that in some days, sounds like a bug.
There
is a link to the Plesk forum.