Batch commit throw DEADLINE_EXCEEDED but it actually create the documents

Environment

• Operating System version: Mac M1 arm64
• Firebase SDK version: 13.0.1
• Firebase Product: firestore
• Node.js version: v20.18.0
• NPM version: 10.9.0

The problem

I've class to handle more then 500 operation by simply creating new batch when reach 500, And when commit I'll run commit on each of the batches, And whenever any commit is failing it go to re-try commit that failed batch.

I had the batch commit fail with error of Deadline exceeded after 60.001s,metadata filters: 0.085s,LB pick: 0.001s,remote_addr=142.250.181.234:443 then after few re-try it was failing for new reason ALREADY_EXISTS: Document already exists and the data was created in the firestore !, If batch commit throw error it shouldn't write in firestore, but it seems commit throw error of the 60s timeout limits but data was actually successfully committed,

full log

commiting batch index 0 , ID: 0_3b6ca345a4a22d6f4d0a2f38eb5507bb
index  0 failed 4 DEADLINE_EXCEEDED: Deadline exceeded after 59.998s,metadata filters: 0.086s,remote_addr=142.250.181.234:443
commiting batch index 1 , ID: 1_a20059deface571877dbc25093dee067
index  1 failed 4 DEADLINE_EXCEEDED: Deadline exceeded after 59.889s,metadata filters: 0.041s,remote_addr=142.250.181.234:443
commiting batch index 2 , ID: 2_de705d40bf041659aa787c5e749ea4d3
index  2 failed 4 DEADLINE_EXCEEDED: Deadline exceeded after 59.999s,metadata filters: 0.025s,remote_addr=142.250.181.234:443
re-commit batchs count  3
total batchs 3 Retry count 2
start commit in sequentially mode
commiting batch index 0 , ID: 0_3b6ca345a4a22d6f4d0a2f38eb5507bb
index  0 failed 4 DEADLINE_EXCEEDED: Deadline exceeded after 59.999s,metadata filters: 0.087s,remote_addr=142.250.181.234:443
commiting batch index 1 , ID: 1_a20059deface571877dbc25093dee067
index  1 failed 4 DEADLINE_EXCEEDED: Deadline exceeded after 60.000s,metadata filters: 0.045s,remote_addr=142.250.181.234:443
commiting batch index 2 , ID: 2_de705d40bf041659aa787c5e749ea4d3
index  2 failed 6 ALREADY_EXISTS: Document already exists: projects/PROJECT_ID/databases/(default)/documents/COLLECTION_NAME/KSYlyNKEwJ4tkKGyZ0WR
re-commit batchs count  3
total batchs 3 Retry count 3
start commit in sequentially mode
commiting batch index 0 , ID: 0_3b6ca345a4a22d6f4d0a2f38eb5507bb
index  0 failed 4 DEADLINE_EXCEEDED: Deadline exceeded after 59.999s,metadata filters: 0.086s,remote_addr=142.250.181.234:443
commiting batch index 1 , ID: 1_a20059deface571877dbc25093dee067
index  1 failed 4 DEADLINE_EXCEEDED: Deadline exceeded after 59.999s,metadata filters: 0.043s,LB pick: 0.001s,remote_addr=142.250.181.234:443
commiting batch index 2 , ID: 2_de705d40bf041659aa787c5e749ea4d3
index  2 failed 6 ALREADY_EXISTS: Document already exists: projects/PROJECT_ID/databases/(default)/documents/COLLECTION_NAME/KSYlyNKEwJ4tkKGyZ0WR
re-commit batchs count  3
total batchs 3 Retry count 4
start commit in sequentially mode
commiting batch index 0 , ID: 0_3b6ca345a4a22d6f4d0a2f38eb5507bb
index  0 failed 4 DEADLINE_EXCEEDED: Deadline exceeded after 59.999s,metadata filters: 0.086s,remote_addr=142.250.181.234:443
commiting batch index 1 , ID: 1_a20059deface571877dbc25093dee067
index  1 failed 6 ALREADY_EXISTS: Document already exists: projects/PROJECT_ID/databases/(default)/documents/COLLECTION_NAME/fMQvNaE8y6m8Gx7hUwdb
commiting batch index 2 , ID: 2_de705d40bf041659aa787c5e749ea4d3
index  2 failed 6 ALREADY_EXISTS: Document already exists: projects/PROJECT_ID/databases/(default)/documents/COLLECTION_NAME/KSYlyNKEwJ4tkKGyZ0WR
Reached max try limit,  4 aborting commits.

Steps to reproduce:

I had bad internet and I was writing the 1300 documents with create operation

Relevant Code:

Code of my class

	_createBatch(index) {
		const batch = {
			id: index + '_' + crypto.randomBytes(16).toString('hex'),
			batch: this.firestore.batch(),
		}
		this.batches.push(batch)
		return batch
	}

	async commit() {
			for (let i = 0; i < originalBatchsCount; i++) {
				const item = this.batches[i]
				if (showBatchCounterLog) {
					console.log('commiting batch index', i, ', ID:', item.id)
				}
				try {
					await item.batch.commit()
					console.log('index is finished', i, 'ID', item.id)
					fulfilledIDs.push(item.id)
				} catch (e) {
					console.log('index ', i, 'failed', e.message)
				}
			}
}