Do you guys stutter when miming the words you struggle with, or do you only stutter when actually trying to talk normally with your voice box 'activated' as well as the mouth/tongue/jaw movements?

Do you guys stutter when miming the words you struggle with, or do you only stutter when actually trying to talk normally with your voice box 'activated' as well as the mouth/tongue/jaw movements? I'm an audio engineer (this will become relevant later), and something has suddenly clicked for me regarding my stutter and ways in which we can go about reducing the severity of it...potentially. Even if this doesn't help, if I have to live with this thing I at least want to understand and dissect the fucker. A word I really struggle to say is 'bubble'. I can mime it perfectly though, sometimes there's a little 'wiggle' if you know what I mean but over 95% of the time when I mime the word with my mouth I'm completely fluent and wiggle/twitch-free, which is amazing because it's one of those words for me where I just completely give up every time. I struggle saying that word (and similar words) so much that it actually feels 'new' and weird to mime it fluently with my lips, that's how much I avoid it! I only stutter when I say the word with my voice box as well (basically when I try to say it normally), and that's probably because over the years I've just associated normal talking with difficulty, frustration, embarrassment and anxiety. After this experiment I switched it around and isolated the voice box sound instead and didn't make the mouth movements for the word 'bubble', so I basically just hummed the two syllables of bubble in the same pitch I would if I were saying it, and yet again, I could do it. It's only when the two go together which is when I stutter on the word. I'm planning on making a YouTube video for you guys privately about this (this is where my audio background will come in), so I'd really appreciate some data to work with to see if this is a 'thing' that you guys experience too. Just so you know, I'm a covert stutterer so I'm fucking awful in situations where I HAVE to say a word, and there's no alternative. Thanks for reading and stay strong guys.