One MAJOR Issue With EF Lenses on Lumix S5ii

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THE GEAR I USE:
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CAMERAS:
My Main Cam (Lumix S5ii)
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My B-Cam (Lumix S5)
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My C-Cam (Lumix S1)
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PRIME LENSES:
Panasonic LUMIX 24mm F1.8
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Panasonic LUMIX 35mm F1.8
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Panasonic LUMIX 85mm F1.8
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ZOOM LENSES:
Sigma 28-70 F2.8
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Panasonic LUMIX 16-35 F4
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Panasonic LUMIX 70-200 F4
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AUDIO SETUP:
Rode NTG4+
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Tascam DR60 MKii
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Hollyland Lark 150
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LIGHTING SETUP
Godox LA200d
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Colbor CL60
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Godox SL60w
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Smallrig Softbox
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DESK & COMPUTING
My Main Computer (Mac Mini)
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Laptop (M1 Pro MacBook Pro 1TB)
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Computer Monitor (Viewsonic ColorPro VP2786-4K)
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Logitech Craft Keyboard
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Logitech M590 Mouse
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Samsung T5 SSD 1TB
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SanDisk G-Drive 6TB
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When using EF Lenses for photography with the Lumix S5ii, there seems to be a slight shutter delay even when you're shooting with higher frame rates.
Even though both the Lumix S5ii and the Sigma MC-21 are running on the latest firmware, it seems that there's some form of a communication issue (but only when using EF lenses).
The photos still come out looking absolutely fine, but it doesn't give me much confidence when I'm out shooting and the shutter sounds like it isn't quite actuating the way it should be.
Definitely something to make a point of, and hopefully this will be resolved by Panasonic and Sigma as quickly as possible!