Is this typical protocol for Whataburger?

Is it normal policy to terminate an employee who had no history of disciplinary actions, never received any poor performance reviews or never was informed they weren't meeting job expectations? And the reason for termination given was failure to report. Not failure to report an illness or accident just failure to report. To give context I am or was a Manager Job Step 1. I was due to be certified on the 27th of this month. There was an incident where the area manager found a plastic box out by the dumpster area. I was on break smoking a cigarette and he asked if it was mine. I informed him it was not however, I did use the lighter inside the box because I didn't have one. And I was not sure who the box belonged to. I also told him that around 2pm (he found the box at 4pm) I went out to dumpster area to check drain plug(I was doing the required task on our tablet) and there were two employees out there. I spoke to them briefly but did not notice if either one had that box in their possession. They were smoking their vapes. But I didn't notice the box or either one of them holding it or anything. Apparently, according to area manager the box had marijuana in it. I myself did not see it nor was I given the chance to inspect the contents myself. When I borrowed the lighter there was a package under the lighter. But, it looked like a something bought from a store or shop. It wasn't like a random baggie or anything. We are in Texas just for reference. When he told me it was marijuana my response was "what type of weed comes in a store bought package?" To best of my knowledge marijuana hasn't been fully legalized in Texas. And when I noticed the two employees out by the dumpster I didn't see them smoking weed or any type of cart. They were smoking their vapes. I could tell they were vapes because it was really fruity sweet smell. Not the more pungent weed smell. So long story short when he questioned me and about the box I gave him an honest response I honestly wasn't certain who it belonged too. (Turns out it was the of the employees box that was out by the dumpster). On video if you zoomed in you could then see one of them holding the box. When I was out there I did not notice one of them holding the box. Also, I told him when I saw them I didn't detect the presence of weed. It didn't smell like weed and I didn't see them actively smoking a blunt or anything. So, there wasn't any reason for me to report anything because I didn't witness anything. Also the same day all of this happened I disclosed the fact that I was diagnosed with ASD two and half years ago. My diagnosis was very late as I am now 46. I had to disclose this fact not because I felt it was safe to or I wanted too. Up until that particular day I had done very well masking or hiding my autistic traits. I have only been officially diagnosed for a short time. However, I have already noticed in that short time once supervisors find out, at least in my experience, their tone and the way they treat me changes. And I start scoring lower on reviews or not being offered any promotions. Plus get treated like I have a very low intelligence level So, when I started with Whataburger on Dec 2, 2024 I opted not to disclose my ASD. Back to my point the day this alleged weed incident took place, I had gotten too overstimulated and was not able to hide or camouflage that. I had done very well doing just that but some days it gets really exhausting and hard to do especially trying to learn everything about Whataburger and work at the pace they expect. So, I guess that day I was just too drained and I didn't have a full meltdown but it was very clear there was obviously something off or wrong with me. So I had to be pulled off of Gator. My area manager witnessed this and directly asked me if I was Autistic. I could not lie at that point. Not disclosing it is one thing but, lying when directly questioned was not an option for me. Twenty-four hours later I was terminated for failing to report. I wasn't allowed or given chance to read or go over document I was told to sign. And for some reason my area manager told me that even though they were terminating me they would offer me a neutral job reference if I used them. I apologize this was long. But I wanted to insure all information was included. Is any of what happened to me a typical thing? Or how they would normally discipline someone?