Hmmm  Actually I could not reproduce your problem

I put runnable sdl and maps in p.b.scene-files

but the relevant sdl looked like this:

         #local MyTex =
         texture {
                 pigment {
                         image_map {
                                 tga "im_oak.tga"
                         }
                 }
                 normal {
                         bump_map {
                                 tga "bm_oak.tga" bump_size 4
                         }
                 }
                 finish {
                         diffuse .7
                         specular .5
                         roughness .1
                         reflection 0
                 }
         }

         bicubic_patch {
           type 1
            flatness 0.1
           u_steps 3
           v_steps 3
           <0, 1,  3> <1, 1, 3> <2, 1, 3> <3, 1, 3>
           <0, 1,  2> <1, 1, 2> <2, 1, 2> <3, 1, 2>
           <0, 1,  1> <1, 1, 1> <2, 1, 1> <3, 1, 1>
           <0, 1,  0> <1, 1, 0> <2, 1, 0> <3, 1, 0>

           texture {
              image_pattern {
                 tga "ip_oak.tga" use_alpha
              }
              texture_map {
                 [0
                         pigment { rgb 1 transmit 1 }
                         finish {
                                 diffuse 0
                                 specular 0
                                 reflection 0
                                 ambient 0
                         }
                 ]
                 [1
                         MyTex
                 ]

              }
              scale 3
              rotate x*90

           }

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