[FIXED] Friendship immediately maxes out after introduction

TL/DR: Friendship maxed / almost maxed twice in-person, once on "chatting" on PC, with a brand new sim/neighborhood with no mods made with no friendhip-boosting qualities. Only contributing factor could be Micro home lot trait. I have a save immediately prior and immediately after and this is repeatable in the save.

Details:
Product: The Sims 4
Platform:PC
Which language are you playing the game in? English
How often does the bug occur? Every time (100%)
What is your current game version number? 1.72.28.1030 (fully updated as of 4/18/2021)
What expansions, game packs, and stuff packs do you have installed? All except: Kits, Snowy Escape, Paranormal, Batuu, My First Pets, Backyard stuff, Vintage Glamour, Luxury Party, Spooky, Toddler, and Kids Room.
Steps: How can we find the bug ourselves? Introduce yourself w/ friendly introduction to a sim even if you have no friendship-boosting qualities; also try it in a Micro Home. You can also request my saves.
What happens when the bug occurs? After introducing them or having them talk to someone they either fill up the bar completely (if on a micro home) or it will be nearly at friendship (if regular residential lot).
What do you expect to see? When you introduce them the bar fills only a little unless sim has other traits/tc.
Have you installed any customization with the game, e.g. Custom Content or Mods? No; also
Did this issue appear after a specific patch or change you made to your system? Not sure; hard to notice when so many of my sims have high charisma/Polite introductions, but it has in general seemed just ridiculously easy since Snowy Escape came out (which I don't have).

What happened to me:

I had this problem on a mod-free "testing" sim save when I was trying to re-create a different bug. I had also cleared out all of my caches immediately prior to making this new save game/neighborhood. I have a save right before it happened (but option not qued) and right after it happened. I can upload these, but haven't, because the FAQ says not to upload saves unless requested.

My sim was made in CAS that same sim day in a fresh save. I made him using the "story" option where he rolled with loves outdoors, materialistic, and neat with no other traits from parenthood or any reward traits that could affect his relationships. He also has NO charisma points. I moved him into the maxis-made lot, but I did change the lot type to micro home (smallest type, which does have a double relationship boost or something like that).

How it happened: My sim ordered a pizza. Introduced himself to the pizza NPC immediately after getting it with "Friendly introduction" and you can see the immediate result in the screenshot; almost 100% friendship. You can also see the other sim my sim knows in the screenshot, who my sim had only used the interaction, "Chat with Sim" on the computer also resulted in 100% relationship!  This is a repeated run from my "pre" save. It also occurred with a differently generated Pizza NPC, only the first interaction used was "Tip $10" instead of "Friendly introduction" and it resulted in 100% relationship (I immediately saved after that with "Friendly introduction" qued).

**EDIT**
Okay, on my end it appears to be the micro home causing the 100% friends issue. I opened my "pre bug" save and did it again, but this time, changed the lot to a regular residential lot right before he showed up. Got a high (...too high?), but not ridiculous, relationship boost from a "friendly introduction." It's pictured below. Certainly not enough to make any sense for the Micro Home bonus only be doubled for introductions.