How can two airlines have the same IATA code?

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I have found a peculiarity in the IATA codes used to identify airlines.
Both BHAir (Bulgaria) and Heli France (France) have the IATA code 8H
.
Any ideas why this is and doesn't this cause problems?
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How are IATA airport codes assigned?
IATA code assigned to the airport by IATA consists of 3 letters and created through the airport and city names. Codes are mostly generated with the letters chosen from a city's name. 2-character codes of airports are given in 1930 for the first time. Then three-character codes started to be used.Is airline code and IATA code the same?
IATA airline designator IATA airline designators, sometimes called IATA reservation codes, are two-character codes assigned by the International Air Transport Association (IATA) to the world's airlines.Why are there two types of codes for airports and airlines?
Since the code contains only three letters, the possible combinations are limited and consequently the IATA codes are not unique in some cases, with the same code used to designate two different airports. Therefore, the ICAO codes were created because aviation requires a unique designation for airports.Which airline uses IATA code?
IATA Airline codesIATA code \u2013 MAWBIATA codeIATA airlinesIATA \u2013 001IATA \u2013 AAAmerican AirlinesIATA \u2013 002IATA \u2013 2GCargoItalia (alternate)IATA \u2013 005IATA \u2013 COContinental AirlinesIATA \u2013 006IATA \u2013 DLDelta Air Lines154 more rowsWhy are IATA and ICAO codes different || How do I read an IATA ICAO code || IATA CODE vs ICAO CODE||
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Images: Liam Moore, Ketut Subiyanto, Ketut Subiyanto, Any Lane