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OR operator behaving like AND

See original GitHub issue

Bug description

Generated query with OR uses AND instead.

How to reproduce

With any schema, use query with OR in ˙where˙.

const carriersToProcess = await prisma.carrier.findMany({
	select: {
		carrierID: true,
		lat: true,
		lng: true,
	},
	where: {
		lat: { gt: 0 },
		lng: { gt: 0 },
		origin: { not: { equals: 'S' } },
		OR: {
			regionID: { equals: null },
			districtID: { equals: null },
		},
	},
})

Actual behavior

SELECT `db`.`carrier`.`carrierID`, `db`.`carrier`.`lat`, `db`.`carrier`.`lng` FROM `db`.`carrier` 
WHERE (
`db`.`carrier`.`lat` > ? AND 
`db`.`carrier`.`lng` > ? AND 
`db`.`carrier`.`Zdroj` <> ? AND (
  `db`.`carrier`.`regionID` IS NULL AND 
  `db`.`carrier`.`districtID` IS NULL )
) 
ORDER BY `db`.`carrier`.`carrierID` ASC LIMIT ? OFFSET ?

Expected behavior

SELECT `db`.`carrier`.`carrierID`, `db`.`carrier`.`lat`, `db`.`carrier`.`lng` FROM `db`.`carrier` 
WHERE (
`db`.`carrier`.`lat` > ? AND 
`db`.`carrier`.`lng` > ? AND 
`db`.`carrier`.`Zdroj` <> ? AND (
  `db`.`carrier`.`regionID` IS NULL OR 
  `db`.`carrier`.`districtID` IS NULL )
) 
ORDER BY `db`.`carrier`.`carrierID` ASC LIMIT ? OFFSET ?

Environment & setup

OS: Windows
Database: MySQL
Node.js version: v12.16.1
Prisma version:

@prisma/cli          : 2.12.1
@prisma/client       : 2.12.1
Current platform     : windows
Query Engine         : query-engine cf0680a1bfe8d5e743dc659cc7f08009f9587d58 (at node_modules\@prisma\engines\query-engine-windows.exe)
Migration Engine     : migration-engine-cli cf0680a1bfe8d5e743dc659cc7f08009f9587d58 (at node_modules\@prisma\engines\migration-engine-windows.exe)
Introspection Engine : introspection-core cf0680a1bfe8d5e743dc659cc7f08009f9587d58 (at node_modules\@prisma\engines\introspection-engine-windows.exe)
Format Binary        : prisma-fmt cf0680a1bfe8d5e743dc659cc7f08009f9587d58 (at node_modules\@prisma\engines\prisma-fmt-windows.exe)
Studio               : 0.322.0