It’s not a Cubase limitation but a limitation of the .Wav file standard. No .Wav file can be larger than 4 GB, if you need larger files then use the W64 standard (64 bit Wave).
From the wiki https://en.wikipedia.org/wiki/WAV
The WAV format is limited to files that are less than 4 GiB, because of its use of a 32-bit unsigned integer to record the file size header (some programs limit the file size to 2 GB). Although this is equivalent to about 6.8 hours of CD-quality audio (44.1 kHz, 16-bit stereo), it is sometimes necessary to exceed this limit, especially when greater sampling rates, bit resolutions or channel count are required. The W64 format was therefore created for use in Sound Forge. Its 64-bit header allows for much longer recording times. The RF64 format specified by the European Broadcasting Union has also been created to solve this problem.