Formik: After submitting a form the isSubmitting property is automatically set back to false without calling setSubmitting()

[kbi-daniel]

🐛 Bug report

Current Behavior

After submitting a form the isSubmitting property is automatically set back to false without calling setSubmitting(). Note how fields and buttons are disabled after clicking submit, but then become reenabled.

Expected behavior

isSubmitting should remain true until developer calls setSubmitting(true)

Your environment

| Software | Version(s) |
| ---------------- | ---------- |
| Formik | 2.0.3
| React | 16.11.0
| Browser | Chrome
| npm/Yarn | NPM
| Operating System | Windows

[dlindahl]

This looks like a dupe of #1957

[ziaulrehman40]

I can confirm the issue, not on all forms but on some, weird...

[akomm]

Can confirm it fixed in 2.1 in my case.