Request a build the build agent service log is build failed but it will be build successful.

I had similar issue and BUILD FAILED on my z/OS:

* /u/ibmuser/loaddir/macrodefs.xml:324: com.ibm.jzos.RcException: BPXWDYN failed; S99ERROR/S99INFO = 0x438/0x0 RC=70778880 (0x4380000)
* Caused by: /u/ibmuser/loaddir/macrodefs.xml:324: com.ibm.jzos.RcException: BPXWDYN failed; S99ERROR/S99INFO = 0x438/0x0 RC=70778880 (0x4380000)
* Caused by: com.ibm.jzos.RcException: BPXWDYN failed; S99ERROR/S99INFO = 0x438/0x0 RC=70778880 (0x4380000)

I viewed the macrodefs.xml and found a missing dataset on z/OS (DSN=CICSTS.V3R2M0.CICS.SDFHMAC):

 VIEW       /u/ibmuser/loaddir/macrodefs.xml                Columns 00010 00081
 Command ===>                                                  Scroll ===> CSR 
 000324 <antz:mvsexec buildResultUUID="${buildResultUUID}" callMethod="0" comman
 000325    <antz:variable name="&amp;RTCReturnCodeForTranslator" value="@{var.1.
 000326    <antz:alloc componentName="@{source.component}" dd="SYSIN" dsn="@{sou
 000327    <antz:alloc dd="SYSPUNCH" dsn="${team.enterprise.scm.resourcePrefix}.
 000328    <antz:alloc dd="SYSPRINT" parm="tracks space(5,5) unit(VIO)  new" pub
 000329    <antz:alloc dd="SYSUT1" parm="tracks space(5,5) unit(VIO)  new"/>   
 000330    <antz:alloc dd="SYSUT2" parm="tracks space(5,5) unit(VIO)  new"/>   
 000331    <antz:alloc dd="SYSUT3" parm="tracks space(5,5) unit(VIO)  new"/>   
 000332    <antz:concat dd="SYSLIB">                                           
 000333       <antz:alloc dd="SYSLIB" dsn="CICSTS.V3R2M0.CICS.SDFHMAC" parm=" sh
 000334       <antz:alloc dd="TMP00110" dsn="SYS1.MACLIB" parm=" shr"/>        
 000335    </antz:concat>                                                      
 000336    <antz:alloc dd="TASKLIB" dsn="ASM.SASMMOD1" parm="shr"/>            
 000337 </antz:mvsexec> 

Ran in the similar issue; RTC EE zOS dependency build fails with

com.ibm.jzos.RcException:

BPXWDYN failed; S99ERROR/S99INFO = 0x438/0x0 RC=70778880 (0x4380000)

But in my case BUILD FAILED.