discord.js: A valid token is being considered invalid

Please describe the problem you are having in as much detail as possible: I can’t login to the client and the ready event is never fired. Here’s the error I’m getting

(node:689) UnhandledPromiseRejectionWarning: Error [TOKEN_INVALID]: An invalid token was provided.
    at Client.login (/home/runner/<project>/node_modules/discord.js/src/client/Client.js:206:52)
    at Object.<anonymous> (/home/runner/<project>/index.js:2222:20)
    at Module._compile (internal/modules/cjs/loader.js:1137:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10)
    at Module.load (internal/modules/cjs/loader.js:985:32)
    at Function.Module._load (internal/modules/cjs/loader.js:878:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
    at internal/main/run_main_module.js:17:47
(node:689) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:689) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Include a reproducible code sample here, if possible:

const Discord = require('discord.js')
const client = new Discord.Client()

client.on('ready', () =>{
console.log('It works!') // Never fires :/
})

client.login('<token>') // yes, I have double checked many times that it is correct

Further details:

• discord.js version: 12.5.1
• Node.js version: Latest stable
• Operating system: Repl.it
• Priority this issue should have – please be realistic and elaborate if possible: Not sure, but it happens at random
• This happens randomly, and only for one instance of my bot. The other instance works just fine, even with the same token.

Relevant client options:

• partials: none

• gateway intents: none

• other: none

• I have also tested the issue on latest master, commit hash: