5500-EZ - noticed typo/mistake on annual fillings. Amendment or leave it be?

[NewHope]

I've filed the 5500-EZ for my Solo401k for tax years 2021 (once it hit $250k) through 2025. I just noticed that the effective original date is 1/1/18, but I've been putting 1/1/19 on all the 5500-EZ forms from 2021 to 2025.

Now, I'm considering opening up a Mega Backdoor Roth, and MySolo401k.net has to restate the Solo401k plan and needs the original effective date (I called E-Trade to ask and that's how I noticed the discrepancy).

I've read horror stories on here about people amending their 5500-EZ forms that have been filed on time/yearly and being slapped (it seems automatically?) with late penalties of $150,000 per year, such as here: 

 

1. What do I do? Let sleeping dogs lie and continue putting the 1/1/19 date on the yearly 5500-EZ forms moving forward? If I put 1/1/18 on the 5500-EZ form for next year, will that trigger some kind of alert on the IRS' end with the associated $150,000 yearly penalties?

2. Do I need to amend every 5500-EZ from 2021 through 2025?

3. Does the plan restatement by Solo401k.net get sent to the IRS in any way or just to E-trade?

Appreciate tips/advice! Thanks!

[fmsinc]

See https://www.dol.gov/sites/dolgov/files/ebsa/employers-and-advisers/plan-administration-and-compliance/reporting-and-filing/form-5500/2023-instructions.pdf

and

https://wrangle5500.com/form-5500-errors-dol-audit/

The penalty for a typo of the type (pun intended) with which you are dealing is ..... 

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSvGdNyaLvTt4L4Un7XBc-Hd1WusD0wyeMXNUWiJfPjPQ&s=10

 

[NewHope]

1 hour ago, fmsinc said:

See https://www.dol.gov/sites/dolgov/files/ebsa/employers-and-advisers/plan-administration-and-compliance/reporting-and-filing/form-5500/2023-instructions.pdf

and

https://wrangle5500.com/form-5500-errors-dol-audit/

The penalty for a typo of the type (pun intended) with which you are dealing is ..... 

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSvGdNyaLvTt4L4Un7XBc-Hd1WusD0wyeMXNUWiJfPjPQ&s=10

 

Haha! I'm guessing there's nothing to do then? I'll just update the effective date on next year's 5500-ez.