Bug when decoding some of those proto in firebase

Hi,

I have a bug when using `firebase-emulator`, here are some logs and the error

```js
{"severity":"INFO","message":"------ runCloudEvent: calling trigger with {\n specversion: '1.0',\n type: 'google.cloud.firestore.document.v1.created',\n source: '//firestore.googleapis.com/projects/projects/demo-gouach/databases/(default)',\n id: 'e0cfdd27-757a-4217-a68e-7eb7145c0c2a',\n subject: 'documents/battery-bms-types/1865_v3.1',\n time: '2025-02-21T13:48:14Z',\n datacontenttype: 'application/protobuf',\n dataschema: 'https://github.com/googleapis/google-cloudevents/blob/main/proto/google/events/cloud/firestore/v1/data.proto',\n location: 'us-central1',\n project: 'demo-gouach',\n database: '(default)',\n namespace: '(default)',\n document: 'battery-bms-types/1865_v3.1',\n data: \n}"}
```
```js
{"severity":"ERROR","message":"Error: Failed to decode protobuf and create a snapshot.\n at entryFromArgs (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/lib/logger/index.js:133:19)\n at Object.error (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/lib/logger/index.js:120:11)\n at createSnapshotFromProtobuf (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/lib/common/providers/firestore.js:61:16)\n at createSnapshot (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/lib/v2/providers/firestore.js:172:59)\n at makeFirestoreEvent (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/lib/v2/providers/firestore.js:209:15)\n at func (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/lib/v2/providers/firestore.js:300:32)\n at /Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-tools@13.31.1_encoding@0.1.13/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:526:16\n at runFunction (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-tools@13.31.1_encoding@0.1.13/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:506:15)\n at runCloudEvent (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-tools@13.31.1_encoding@0.1.13/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:523:11)\n at processBackground (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-tools@13.31.1_encoding@0.1.13/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:490:16)"}
```
```
⚠ functions: TypeError: Cannot read properties of undefined (reading 'cloud')
at Function.decode (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/protos/compiledFirestore.js:1529:130)
at createSnapshotFromProtobuf (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/lib/common/providers/firestore.js:57:52)
at createSnapshot (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/lib/v2/providers/firestore.js:172:59)
at makeFirestoreEvent (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/lib/v2/providers/firestore.js:209:15)
at func (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-functions@6.3.2_firebase-admin@13.1.0_encoding@0.1.13_/node_modules/firebase-functions/lib/v2/providers/firestore.js:300:32)
at /Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-tools@13.31.1_encoding@0.1.13/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:526:16
at runFunction (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-tools@13.31.1_encoding@0.1.13/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:506:15)
at runCloudEvent (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-tools@13.31.1_encoding@0.1.13/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:523:11)
at processBackground (/Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-tools@13.31.1_encoding@0.1.13/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:490:16)
at /Users/primet/work/gouach/code/gouach-backend/node_modules/.pnpm/firebase-tools@13.31.1_encoding@0.1.13/node_modules/firebase-tools/lib/emulator/functionsEmulatorRuntime.js:692:27
⚠ Your function was killed because it raised an unhandled error.
```

I dumped the protobuf `data.bin` and downloaded the `data.proto` from the given URL, that I join on this error, here is what happens when I decode it "raw" and with the schema

```sh
cat data.bin|protoc --decode_raw
```

```
1 {
1: "projects/demo-gouach/databases/(default)/documents/battery-bms-types/1865_v3.1"
2 {
1: "description"
2 {
17: "The v3.1 BMS for 1865 cells"
}
}
2 {
1: "fields"
2 {
6 {
1 {
1: "version"
2 {
17: "v3.1"
}
}
1 {
1: "cell_format"
2 {
17: "1865"
}
}
1 {
1: "min_voltage"
2 {
2: 8
}
}
1 {
1: "wired_communication_protocol"
2 {
17: "CAN"
}
}
1 {
1: "screw_sensing"
2 {
1: 1
}
}
1 {
1: "predischarge_current_amps"
2 {
3: 0x3fe3333333333333
}
}
1 {
1: "mosfet_count"
2 {
2: 12
}
}
1 {
1: "can_ic_model"
2 {
17: "TCAN1051H_SOIC"
}
}
1 {
1: "mosfet_model"
2 {
17: "BSC040N08"
}
}
1 {
1: "esp32_silicon_version"
2 {
17: "v3"
}
}
1 {
1: "can_resistor_model"
2 {
17: "TLP170G"
}
}
1 {
1: "esp32_flash_size_mb"
2 {
2: 16
}
}
1 {
1: "power_supply_model"
2 {
17: "LM5010A"
}
}
1 {
1: "battery_ic_model"
2 {
17: "BQ76952"
}
}
1 {
1: "shunt_count"
2 {
2: 3
}
}
1 {
1: "shunt_individual_value_milli_ohms"
2 {
2: 2
}
}
1 {
1: "fuse_model"
2 {
17: "0684L9400-01"
}
}
}
}
}
2 {
1: "created_at"
2 {
3: 0x41d9ee20f3a96873
}
}
2 {
1: "created_by_id"
2 {
17: "iKAl8bUSDYoAHQAEvdyMScLRJWaT"
}
}
2 {
1: "created_by_email"
2 {
17: "batbot@gouach.com"
}
}
3 {
1: 1740145614
2: 653618000
}
4 {
1: 1740145614
2: 653618000
}
}
3: ""
```

and with the schema

```sh
git clone https://github.com/googleapis/googleapis.git
protoc --proto_path=. --proto_path=googleapis --decode=google.events.cloud.firestore.v1.DocumentEventData data.proto < data.bin
```

```
value {
name: "projects/demo-gouach/databases/(default)/documents/battery-bms-types/1865_v3.1"
fields {
key: "created_at"
value {
double_value: 1740145614.647
}
}
fields {
key: "created_by_email"
value {
string_value: "batbot@gouach.com"
}
}
fields {
key: "created_by_id"
value {
string_value: "iKAl8bUSDYoAHQAEvdyMScLRJWaT"
}
}
fields {
key: "description"
value {
string_value: "The v3.1 BMS for 1865 cells"
}
}
fields {
key: "fields"
value {
map_value {
fields {
key: "battery_ic_model"
value {
string_value: "BQ76952"
}
}
fields {
key: "can_ic_model"
value {
string_value: "TCAN1051H_SOIC"
}
}
fields {
key: "can_resistor_model"
value {
string_value: "TLP170G"
}
}
fields {
key: "cell_format"
value {
string_value: "1865"
}
}
fields {
key: "esp32_flash_size_mb"
value {
integer_value: 16
}
}
fields {
key: "esp32_silicon_version"
value {
string_value: "v3"
}
}
fields {
key: "fuse_model"
value {
string_value: "0684L9400-01"
}
}
fields {
key: "min_voltage"
value {
integer_value: 8
}
}
fields {
key: "mosfet_count"
value {
integer_value: 12
}
}
fields {
key: "mosfet_model"
value {
string_value: "BSC040N08"
}
}
fields {
key: "power_supply_model"
value {
string_value: "LM5010A"
}
}
fields {
key: "predischarge_current_amps"
value {
double_value: 0.6
}
}
fields {
key: "screw_sensing"
value {
boolean_value: true
}
}
fields {
key: "shunt_count"
value {
integer_value: 3
}
}
fields {
key: "shunt_individual_value_milli_ohms"
value {
integer_value: 2
}
}
fields {
key: "version"
value {
string_value: "v3.1"
}
}
fields {
key: "wired_communication_protocol"
value {
string_value: "CAN"
}
}
}
}
}
create_time {
seconds: 1740145614
nanos: 653618000
}
update_time {
seconds: 1740145614
nanos: 653618000
}
}
update_mask {
}
```

[Archive.zip](https://github.com/user-attachments/files/18907598/Archive.zip)

So it seems I manage to parse the protobuf just fine, not sure why it doesn't work in the code (I have the latest firebase-tools, and all the latest versions of the firebase packages, the "fake test database" that does this bug is created from scratch using a script, so there's no stall data or whatever)

this is the code to generate the data

```ts
function createdByBot(data: any, created_at: number | undefined = undefined) {
if (batbotUser === undefined) {
throw new Error("Expected batbotUser to be set");
}
return {
...data,
created_at: created_at || clientTimestamp(),
created_by_id: batbotUser.uid,
created_by_email: batbotEmail,
};
}

const item = createdByBot({
id: "1865_v3.1",
description: "The v3.1 BMS for 1865 cells",
fields: {
version: "v3.1",
cell_format: "1865",
min_voltage: 8,
wired_communication_protocol: "CAN",
screw_sensing: true,
predischarge_current_amps: 0.6,
mosfet_count: 12,
can_ic_model: "TCAN1051H_SOIC",
mosfet_model: "BSC040N08",
esp32_silicon_version: "v3",
can_resistor_model: "TLP170G",
esp32_flash_size_mb: 16,
power_supply_model: "LM5010A",
battery_ic_model: "BQ76952",
shunt_count: 3,
shunt_individual_value_milli_ohms: 2,
fuse_model: "0684L9400-01",
},
})
```

Also when I use the same script in a staging environment (using a real Firebase instance, and not the emulator) it works just fine