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Interacting with calendar causes warning

See original GitHub issue

Environment

Tech	Version
material-ui-pickers	v2.1.1
material-ui	v9.0
React	v17.8
Browser	All
Peer library	date-fns

Steps to reproduce

Interact with a date/time-field
The warning occures

Expected behavior

No warning is given.

Actual behavior

In the console, the following warnins are given:

Starting with v2.0.0-beta.1 date-fns doesn't accept strings as arguments. Please use `parseISO` to parse strings. See: https://git.io/fpAk2

toDate@webpack-internal:///./node_modules/date-fns/esm/toDate/index.js:59:20
isBefore@webpack-internal:///./node_modules/date-fns/esm/isBefore/index.js:36:23
DateFnsUtils.prototype.isBefore@webpack-internal:///./node_modules/@date-io/date-fns/build/index.esm.js:82:16
Calendar/_this.shouldDisableNextMonth@webpack-internal:///./node_modules/material-ui-pickers/dist/material-ui-pickers.esm.js:1465:65
Calendar</Calendar.prototype.render@webpack-internal:///./node_modules/material-ui-pickers/dist/material-ui-pickers.esm.js:1616:25
hotComponentRender@webpack-internal:///./node_modules/react-hot-loader/dist/react-hot-loader.development.js:728:17
proxiedRender@webpack-internal:///./node_modules/react-hot-loader/dist/react-hot-loader.development.js:748:12
finishClassComponent@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:14534:22
updateClassComponent@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:14489:24
beginWork@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:15335:16
performUnitOfWork@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:18150:12
workLoop@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:18190:24
renderRoot@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:18276:7
performWorkOnRoot@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:19165:7
performWork@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:19077:7
performSyncWork@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:19051:3
interactiveUpdates$1@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:19320:7
interactiveUpdates@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:2169:10
dispatchInteractiveEvent@webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:4880:3
 index.js:57